a few weeks ago DxO came out with a new product called Viewpoint. it allows for adjustments in the distortion of an image. i had t on my machine since it came out but didn't give it any time to look over. well i was in Bodie the other day and and shot an image of the schoolhouse using the 17mm end of a sigma 17-70/2.8-4 on a D7000. due to its distance and the angle i shot from it keystoned nicely. i threw it into Viewpoint and did s simple operation and i am pretty much sold on its abilities. it took about 2 minutes to do.